TO WHOM IT MAY CONCERN This is to declare that both AUDIO SPACE ACOUSTIC LABORATORY LTD. and its wholly-owned factory CORILEX TECHNOLOGY DEVELOPMENT (ZHUHAI) LTD. have never sold any products under the brand names of AUDIO SPACE, DUNTONIC and … Continued

The most effective way is to control the filament voltage of the working tube. This can be done when each of them has the same filament voltage, the tubes will have the same sound and consistent values. The reason why … Continued

Both Vacuum Tube (valve) and Transistor can be made for amplifier. They have their own characteristic, advantage and shortcoming. At the early 80’s, the development of digital audio is at the preliminary phase. People started to use transistor amplifier for … Continued